The trochlear nerve is the fourth of 12 cranial nerves that emerge from the brain and extend down the head, neck, and torso. Cranial nerves help control sensory innervation: i.e., the ability to ...

The glossopharyngeal nerve is one of twelve cranial nerves that connect to the brain. Like the other cranial nerves, the glossopharyngeal nerve is paired — there's one on each side of your brain.